Giulia spider Axle wrap - Alfa Romeo Bulletin Board & Forums
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post #1 of 4 (permalink) Old 06-11-2019, 08:44 PM Thread Starter
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Giulia spider Axle wrap

I have been trying to figure out the cause of this jerking I get under hard acceleration and deceleration. Setting up the car on a lift and lowering the rear axle on jack stands, I could video the drive train and look for where this oscillation originates. Setting the emergency brake and slipping the clutch into third would simulate the condition and I captured it in the following link. The rear axle pinion bounces up and down which looks like a condition in leaf sprung axles called "axle wrap" . It shouldn't happen with our cars unless some link is bad. Considering all the silent blocks are fairly new, I have been stumped. I suspect the reaction triangle ball joint could be worn only because I don't remember the condition when I rebuilt the rear suspension and have run out of other ideas. The only non-stock item are the Centerline stiffer rear springs which should be a plus although they are a shorter springs.


I thought the vintage racing folks may have run into this before. Any ideas?

Best Regards,

Andy Amatruda
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post #2 of 4 (permalink) Old 06-15-2019, 10:08 PM
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Hi,

I will check the state of the ball joint, and the bushes, on the triangle reaction.

But it seems to come from a bad adjustment of the gap between the teeth, in the rear axle... (?)

Chris

Chris, in love with Alfa from...'68, but it wasn't always reciprocal !

Last edited by pescara; 06-15-2019 at 10:39 PM.
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post #3 of 4 (permalink) Old 06-16-2019, 08:54 AM Thread Starter
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Thanks Chris,

I have a new ball joint on order as that is the only item that hasn't been replaced. I have attempted to remove the triangle the the rear axle in place but cannot drive out the tapered pin.
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post #4 of 4 (permalink) Old 06-16-2019, 09:26 AM
But Mad North-Northwest
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Quick test for the reaction triangle. Drive down a street slowly, take your hands off the wheel, and get on and off the throttle. If you can steer the car left and right with the throttle, your bushes are probably bad.
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Tom

1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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